Power driven eraser for typewriters



Feb. 26, 1935. .H, B, WAN 1,992,679

POWER DRIVEN ERASER FOR TYPEWRITERS Filed April 23, 1934 3 Sheets-Sheet l Inventor By I flllorney Invenlor 3 S ets-Sheet 2 Feb. 26, 1935. H, B, SWAN POWER DRIVEN ERASER FOB. TYPEWRITERS Filed April 23, 1954 w i |.-||||w-II.. w

Feb. 26, 1935.

H. B. SWAN POWER DRIVEN ERASER FOR TYPEWRITERS Filed April 23, 1954 3 Sheets-Sheet 3 imam rowan on nnasan roa Ens Henry 3. Swan, W I

This device has reference to attachments for eraser at a predetermined position'upon the paper being typewritten upon for the, purpose oferasureto the end that any symbol or symbols desired may be removed from the paper.

An object of the invention is to provide a power driven eraser that may be readily used in conjunction with a typewriter to facilitate the making of required erasures.

The invention together with its. objects and advantages will be best understood from a study of the following description taken in connection with the accompanying drawings wherein:

.Figure 1 is a rear side elevational view of the eraser.

Figure 2 is an enlarged view thereof with cer- 2o tain parts omitted, and other parts broken away,

and still other parts shown in section.

Figure 3 is an end view with certain parts broken away and shown in section.-

Figure 4 is a perspective 'view of an arm equipped at one end with a gear, and at a relatively opposite end with an erasure guide.

Figure 5 is an eievational view of a gearhereinafter more fully referred to, and

Figure 6 is a view taken at right angles to Figure 5.

Referring to the drawings by reference numerals it will be seen that there is provided a disk shaped eraser 1 suitably mounted on a horizontal shaft 2 which is carried in an arm 3 projecting from a 'vertical turret 4 rising from a hollow base member 8. The arm 2 is driven through the 'medium of suitable gearing 6 from a vertical shaft 5 that extends upwardly from the base 8 into the turret 4.

The shaft 5 is in turn driven from a horizontal shaft 9 through the medium of reduction gearing 10. The shaft 9 is suitably provided at one end as at 1'7 for connection with a flexible shaft, and through such a shaft to a motor suitably provided to furnish wer for the device.

Suitably mounted within the base 8 is a toggle switch 11 and the operating member or lever of the ,switch, and indicated by the reference numeral 11a operates in a suitable slot in the top of the base 8 and is arranged in position to be engaged and operated by a pin 12 carried by the turret 4 for throwing the switch 11. -The turret 4 is mounted on the base 8 to rotate about a vertical axis through the medium ofa collar 14 secured to the top of the base in any suitable manner and having a flange overlying and engaging a flange 15 provided at the base of the turret 4 as clearly shown in Figure'2. The turret 4: is normally urged to rotate in one direction through the medium of a coil spring 16 disposed about the .shaft 5 and anchored at one end to the top of the'base 8 and at a relatively opposite end to the turret 4 in a manner clearly shown in I Figure 2. Rotative movement of the turret 4 is limited, on the one hand, by the engagement of the eraser 1 with the paper, and on the other hand by engagement of the pin 12 with a fixed pin 13 rising from. the flanged upper end of the collar 14.

sides of the head of the stud 20 are springs 21 that are suitably anchored at one end to a block 22 located adjacent the lower end of the standard 18. A mutilated or section of beveled gear 24 is provided at the base of the turret immediately above the collar 14 and is provided with a smaller number of teeth than the gear 19. The gear 24 is located on the side of the turret opposite to the arm 3 and is adapted to engage th gear 19 when the turret is oscillated. The gear 19 is formed on one end of an arm 23 which extends parallel to the arm 3, and on its free end the arm 23 is provided with an enlarged apertured head forming an, eraser guide 27. The arm 23 is normally held in a horizontal position by reason of the engagement of the springs 21 with the flattened sides of the stub shaft'or stud 20. i

The electric cord for the switch 11 is indicated by the reference numeral 25, and as shown leaves the base through the insulating washer 26 to connect to the motor furnishing the power, and

attached to the rear of the typewriter by 'a clamp or in any other suitable manner to facilitate moving the typewriter.

In actual practice it is intended that the de- 5 vice forming the subject of the invention be mounted onthe top plate of the typewriter on either side of the center of thetypewriter between the spools carrying the ribbon and the carriage so that the eraser will touch any portion of a line desired by moving the carriage.

When not in use the arm 3 carrying the eraser is left parallel with the carriage of the typewriter, with the eraser 1 at the outside edge of,

the typewriter.

To place in operation the handle 7 is grasped and moved in an arc toward-the-operator and the center of the typewriter.

As the turret 4 commences to move, the pin 12 engages the operating lever of the switch 11, and as the turret continues to move, swings the lever 11a of the switch in a manner to close the switch, and thus complete the circuit to the motor (not shown) for furnishing power from the motor tothe shafts 9,5 and 2 for revolvingv then operating to complete the movement of said arm. During reverse movement of the arm 3 under the influence of spring 16 the operation of the gears 19 and 24 and springs 21 is reversed.

It will be understood that the arm 3 is swung until the eraser touches the paper and held there a moment, then by releasing slightly the paper may be viewed while the guide remains in position, for the purpose of ascertaining whether a second application of the eraser is necessary to completely remove the symbol. An entire line of, symbols may be erased by moving the carriage of the typewriter while the eraser is in contact with the paper.

If the handle 7 is released at any time when the device is in use the spring 16 will return the arm 3 to the normal out of the way or rest position, during which movement the lever 11a of the switch is returned to its normal or switch opening position by engagement of the pin 12, as the pin returns to its normal position against the stop pin 13 thus limiting the movement of the arm 3 on its return.

The return of the arm 23 to the rest or normal position is effected by a return of the gear 24 and a reversal of the operation above described.

Having thus described my invention, what I claim as new is:

1. An eraser attachment for typewriters comprising a turret mounted to rotate about a vertical axis, an arm extending laterally from the turret, a shaft extending through the arm and mounted to rotate relative to the arm, an eraser on one end of the shaft, and means for driving said shaft including gearing arranged within the turret. i

2. A typewriter attachment comprising a base, a turret mounted on the base to rotate about a vertical axis, a shaft extending upwardly through the base to terminate within the turret, an arm extending laterally from the turret, an eraser mounted at one end of the arm to rotate about an axis extending longitudinally through said arm, a driving connection between the axis of the eraser and said shaft, and arranged within said turret, and driving means for the shaft arranged within said base.

3. A typewriter attachment comprising a base, aturret mounted on the base to rotate about a vertical axis, a shaft extendingupwardly through the base to terminate within the turret, an arm extending laterally from the turret, an eraser mounted at one end of the arm to rotate about an axis extending longitudinally through said arm, a driving connection between the axis of the eraser and said shaft, and arranged within said turret, and driving means for the shaft arranged within said base, said driving means including a control switch mounted in the base and having a throw lever extending upwardly through a slot in the top of the base; and a pin projecting from the turret and engageable with the throw lever for tripping the switch.

4. A typewriter attachment comprising a base, a turret mounted on the base to rotate about a vertical axis, a shaft extending upwardly through the base to terminate within the turret, an arm extending laterally from the turret, an eraser mounted at one end of the arm to rotate about an axis extending longitudinally through said arm, a driving connection between the axis of the eraser and said shaft, and arranged within said turret, and driving means for the shaft arranged within said base, said driving means including a control switch mounted in the base and having a throw lever extending upwardly through a slot in the top of the base, and a pin projecting from the turret and engageable with the throw lever for tripping the switch, spring means engaged with the base and the turret in a manner to normally cause the turret to rotate in one direction, and a fixed stop pin in the path of the first named pin for limiting movement of the turret.

5. An eraser attachment for typewriters comprising a revolubly mounted turret, an arm extending laterally from the turret, an eraser mounted adjacent the free end of the arm to rotate about an axis extending longitudinally of the arm, means for driving the eraser, a. fixed standardparalleling said turret, a stub-shaft supported by said standard, a mutilated gear on one end of the stub-shaft, an arm extending from said gear andprovided at its free end with an apertured head forming an eraser guide, spring means engaged with the stub-shaft in a manner to resiliently retain the last named arm in a substantially horizontal position, and a mutilated gear on the turret engageable with the first named mutilated gear for causing said arm to swing vertically.

paralleling said turret, a stub-shaft supported by' said standard, a mutilated gear on one end of the stub-shaft, an arm extending from said gear and provided at its free end with an apertured head forming an eraser guide, spring means engaged with the stub-shaft in a manner to resiliently re: tain the last named arm in a substantially horizontal position, and a mutilated gear on the turret engageable with the first named mutilated gear for causing said arm to swing vertically, a handle carried by the first named arm to facilitate manual rotation of the turret, spring means normally urging the turret to rotate in one direction, stop means for limiting movement of the turret in said one direction.

7. An eraser attachment for typewriters comprising a revolubly mounted turret, an arm extending laterally from the turret, an eraser mounted adjacent the free end of the arms to rotate about an axis extending longitudinally of the arm, a fixed standard paralleling said turret, a stub-shaft supported by said standard, a mutilated gear on one end of the stub-shaft, an arm extending from said gear and provided at its free end with an apertured head forming an eraser guide, spring means engaged with the stub-shaft in a manner to resiliently retain the last named arm in a substantially horizontal position, and a mutilated gear on the turret engageable with the first named mutilated gear for causing said arm to swing vertically, a handle carried by the first named arm toifacilitate manual rotation of the turret, spring means normally urging the turret to rotate in one direction, stop means for limiting movement of the turret in said one direction, and electrically operated means for driving the eraser including a switch having an operating lever, and means for throwing said switch incidental to a rotation of the turret.

8. In a device of the class described, an arm pivotally mounted to swing in a horizontal plane, an eraser rotatably mounted at one end of the arm, means to rotate the eraser, a second arm pivotally mounted to swing in a vertical plane, normally paralleling the first arm, an eraser guide on one end of the second arm, and mechanism connecting the arms for swinging the second'arm to place the eraser guide in eflective position relative to the eraser incidental to the swinging of the first arm to move the eraser to erasing position. a I

9. In a mechanical eraser, a rotatably mounted erasing member, supporting means for the eraser swingable in ahorizontal plane, means for driving the eraser member, a guide member positioned adjacent to the peripheral edge of the eraser member, and normally out of effective position relative to the eraser, vertically .swingable supporting means for the guide member, and

mechanism connecting the eraser supporting rmnnr B. swan. 

